[s-cars] Bypass valve questions

[Sean Douglas]

Dave: Try this website - everything you wanted to know about BVs.

http://dv.mistertam.com/

Sean

Sean Douglas
1997 Audi S6
1990 Audi 90Q20V
Surrey, BC
Canada


-----Original Message-----
From: s-car-list-admin at audifans.com
[mailto:s-car-list-admin at audifans.com] On Behalf Of Djdawson2 at aol.com
Sent: Friday, June 20, 2003 1:14 PM
To: s-car-list at audifans.com
Subject: [s-cars] Bypass valve questions


--
[ Picked text/plain from multipart/alternative ]
All,
I recently finished with engine upgrades (RS2 stuff).  Following the
upgrades, I soon noticed the telltale mid-rpm moaning of a failed bypass
valve. Looking around, I noticed Hoppen carried a version of the Bosch
part... suffix of 110 (as opposed to 114 or 108).  There was a long
story about 400 and 500hp MTM engines, and this bypass valve being a
good solution.  I ordered away.  After installing the part, I could
immediately notice the difference.  Huge lag between shifts, and what
seemed to be a missing top end hit.  There isn't much to replacing a
bypass valve... but I double checked.  All was OK (no, I didn't install
it backwards).

I removed the part.  I hooked up the small manifold port via a hose to
some low pressure regulated air (10psi).  It was leaking away.  The
diaphragm must be shot.  My original doesn't do this.  So then I hooked
up air to the valve on the boost inlet port.  The original (108) starts
to seep air at 19-20psi. The new (110) valve begins to seep air at
24-25psi.

Well, I'm not going to bother with another Bosch unit.  It would be one
thing if you got some reasonable service life from it, but what the
heck?  Anyone have a suggestion about a good aftermarket alternative for
our type of application (about24psi boost, in this instance)?  I'm not
looking for anodized purple, or neon illuminated... just a bypass valve
that is effective. TIA, Dave in CO
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